Study on shock wave characteristics of rock fracturing process induced by high-intensity electric detonation with voltage as variable

WANG Ting; NIE Baisheng; ZHANG Zhehao; ZHANG Yilan; LI Yaoqian; LIU Xianfeng; LIU Peng; BAO Song; WANG Qinjie

doi:10.13347/j.cnki.mkaq.20240856

Safety in Coal Mines > 2025 > 56(3): 21-31. > DOI: 10.13347/j.cnki.mkaq.20240856

WANG Ting, NIE Baisheng, ZHANG Zhehao, et al. Study on shock wave characteristics of rock fracturing process induced by high-intensity electric detonation with voltage as variable[J]. Safety in Coal Mines, 2025, 56（3）: 21−31. DOI: 10.13347/j.cnki.mkaq.20240856

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Study on shock wave characteristics of rock fracturing process induced by high-intensity electric detonation with voltage as variable

WANG Ting^1,,
NIE Baisheng^{2, 3, ,},
ZHANG Zhehao^{4, 5},
ZHANG Yilan^{4, 5},
LI Yaoqian⁶,
LIU Xianfeng^{2, 3},
LIU Peng^{2, 3},
BAO Song^{2, 3},
WANG Qinjie⁷

1.
Yangquan Xinyu Geotechnical Engineering Co., Ltd., Yangquan 045000, China
2.
National Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
3.
School of Resources and Safety Engineering, Chongqing University, Chongqing 400044, China
4.
State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources, China University of Mining and Technology (Beijing), Beijing 100080, China
5.
School of Emergency Management and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100080, China
6.
Institute of Industrial Technology Research, Huayang New Material Technology Group Co., Ltd., Yangquan 045000, China
7.
China United Coalbed Methane Co., Ltd.., Beijing 100016, China

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Received Date: June 06, 2024
Revised Date: June 27, 2024

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Abstract

Abstract

High strength electric detonation is a new type of fracturing technology that can efficiently reconstruct coal and rock layers structure, improve the efficiency of coalbed methane mining, increase the proportion of clean energy, and help achieve the “dual carbon” goal; the shock wave energy characteristics of Changqing rock induced by high intensity electric detonation under 16 kV and 204 μF conditions were studied by changing the voltage. The experimental results show that the increase of voltage leads to a decrease in the wavefront time of the voltage curve, and the decrease rate decreases with the increase of voltage, which leads to the increase of the amplitude of voltage wave pattern and the discharge power of high-strength electric detonation, and the increase of shock wave intensity; the direction of maximum shock wave vibration velocity is horizontally from the inner surface of the rock to the outer surface of the rock, which is the main propagation direction of vibration; the main frequency of the vibration energy of shock wave is 0-10 Hz, and the energy is mainly distributed in the range of 0-1 000 Hz; the increase in voltage increases the peak amplitude of the shock wave spectrum and the peak particle velocity of the vibration curve. The increase of voltage makes the shock wave produce stronger instantaneous force, and accelerates the transformation of rock internal structure to instability.

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References

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Study on shock wave characteristics of rock fracturing process induced by high-intensity electric detonation with voltage as variable